英文:
How do I fetch the metadata of a torrent using an Infohash?
问题
我假设在使用该Infohash找到对等方之后，您会发送握手消息，直到一个对等方建立连接。但我似乎在Wireshark中找不到包含元数据的任何数据包。如果可能的话，您能展示一下元数据查询是什么样的吗？
关于元数据，我唯一找到的信息是bep 9，但我觉得有点难以理解，并且在Wireshark中也找不到类似的内容。
英文:
I am assuming that after finding peers using that Infohash you send handshake messages until one peer establishes a connection. But I can't seem to find any packet in Wireshark that has the metadata in it. If possible can you show me how a metadata query looks like?
The only thing I've found about metadata was bep 9 but it was kinda hard for me to understand and I didn't find anything in Wireshark similar
答案1
得分: 1
你已经找到了相关的BEP 9。要实现它，首先必须实现BEP 10，然后检查扩展标头，看对等方是否支持BEP 9，如果支持，则发送一系列带有适当协商的ID的扩展消息，携带元数据请求消息。
在大多数BitTorrent连接中，您应该能看到扩展握手消息，因为许多客户端都支持它。您不太可能看到元数据请求/数据消息（除非您在客户端中明确触发它们），因为这只是比下载种子有效负载更不常见的操作。
英文:
You already found the relevant BEP 9. To implement it you first have to implement BEP 10 and then check the extension header whether the peer supports BEP 9 and if it does send a series of extension messages with the appropriate negotiated IDs carrying a metadata request message.
You should be seeing the extension handshake message in most bittorrent connections since many clients support it. You're less likely to see metadata request/data messages (unless you explicitly trigger them in a client) because it's simply a less common operation than downloading the torrent payload.
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